Hints of hidden heritability in GWAS

Area of Science:

• Genetics
• Quantitative genetics
• Genomics

Background:

• Genome-wide association studies (GWAS) have identified susceptibility loci for complex traits, but these typically explain a small fraction of the total heritability.
• Classical quantitative genetic analyses provide a complementary perspective on the genetic architecture of complex traits.

Discussion:

• This study re-evaluates heritability by considering the aggregate effect of all common single nucleotide polymorphisms (SNPs), not just those reaching genome-wide significance.
• The findings suggest that common SNPs, when analyzed collectively, contribute substantially to the heritability of complex traits, challenging previous interpretations based solely on significant loci.

Key Insights:

• A comprehensive analysis of common single nucleotide polymorphisms (SNPs) reveals a substantial contribution to the heritability of complex traits.
• The discrepancy between GWAS findings and quantitative genetics estimates of heritability may be reconciled by considering the cumulative effect of all common variants.

Outlook:

• Future genome-wide association studies (GWAS) require adjusted sample size recommendations to effectively identify additional susceptibility loci.
• Further research should focus on integrating whole-genome SNP data to better understand the genetic basis of complex diseases and traits.